Liquid-fuel burner of the injection type



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April 6 1926.

Patented Apr. 6, 1926.

tafelen.

'havin nOEEE'rsON BRUCE, OE LONDON, ENGLAND.

LIQUID-FUEL :BURNER OF THE INJECTON TYE.

Application filed December To all whom it may concer Be it known that f l, Davie ltoBEn'rsoN BRUCE, a subject the King ofGreat Britresiding in London, England, have invented certain new and useful improvements j in and Relating tol Liquiddfuel Burners of the Injection Type, of which the following is a specihcation. Y

This invention relates to impr vements in liquid fuel burners. l

According to the present invention liquid fuel is forced through the nozzle of the burner through two or more independent passages arranged at a suitable angle, by means of fluid pressure. ri"here are, however, no independent air or pressure fluid passages through the nozzle, the pressure fluid being admitted to a casing'surrounding the nozzle and thus passing with the fuel jets into the furnace or the like.

The fuelsupply to the nozzle is controlled by aV hand operated needle or like valve and the pressure fluid is controlled by a second i similar hand operated valve.

The fuel supply to the apparatus may be controlled by. the fluid pressure in a known manner so thatwhen the pressure is cut off, the supply of fuel automatically ceases. This may be effected by causing the fuel from the'reservoir to pass through a port in a casing controlled by a reciprocating inember under the action of a spring and the fluid pressure, thespring normally tending to close the fuel port and the pressure to open same. Y l

This reciprocatingmember may also con-Y trol the pressure supply to the fuel feed to the nozzle. 1

To enable the invention to be fully under-. stood it will now be described by reference vtothe accompanying drawing in which :'-r

Fig. 1 is a sectional elevation of a burner4 constructed according to the invention, and

YFigs. 2 and 3 are views of details of the nozzle construction thereof.

As shewn, the burner comprises av nozzle 1 carried on a burner tube 2 mounted in a 'pressure casing 3 having-a flame opening a.

The nozzle l is provided with two independent passages 5 arranged at an angle so as to discharge substantially at the tip of the nozzle. The fluid pressure is admitted to the casing 8 through opening 6, the burner tube being held in a` fluid tight closure 7, by-pass port 8 being provided in the casing 5, 1922. Serial No. 605,124.

for connection with the fuel regulating. device as hereinafter described.

The nozzle is shewn in rear view in Fig. 3 and in order to form a fuel concentrating chamber behind the nozzle, the base may be provided with a transverse slot 9 adapted to receive a. projection 10 formed on a screwed block 11 shaped as shewn in Fig. 2. This blockprovides a conical passage 12 inside the burner tube 2 immediately behind the nozzle, said block having openings 13 coinciding with the passages 5 in the nozzle base, the arrangement being such that the fuel is heaped up or concentrated on the openings 13 owing to the shape of the passage 12 formed in the block 11. ln litting up the burner, the block 11 is first partially screwed into the tube 2 and the nozzle 1 is then placed on the block with its slot 9 engaging the projection 10, the two then being screwed home together. It will be understood that the block and nozzle are -in close engagement during working of the burner. iVi'th this construction the nozzle and block can be readily removedl for cleaning or replaced owing to wear. F ig. 2 shews the block inplan and also a front view.

The burner tube 2 islittedy with a seat 14s for the needle valve 15 controlling thezfuel -supply to the .nozzle and the said tube is fitted into a portion 16 carryingv the fuel and pressure admission and controlling devices for the nozzle. i n

The portion 16 comprises two cylindrical chambers 17, 18, connected by ports '19, 20,

controlled by a valve 21 slidably mounted in chamber 18. The burnerl tube 2 opens into the chamber 17 and the stein of the needle valve 15, which is hollow, extends through the chamber and through an extension22, through uid tight stufling boxes 28, 24;, to an operating handle 25. `On turning the handle 25 the stem 15 will move longitudinally, the screwed collar 26 secured to the stem moving in the threaded interior ofthe stuffing box 2li. Holes 27 are formed in the stem 15 and the chamber 17 is divided by a Huid tight partition 28. A second needley valve 29 is fitted inside the stein l5 controlling a seat 8O near the end of the stem and having an operating knob 8l and a screwed portion 32 working in the boss of handle 25 and serving also to seal the end of the stein 15 as shewn.

Fuel is admitted to chamber 18 through a supply opening 33 and tluid pressure through a pipe 3d connected to the port 8 in easing` 3. The valve 2l is pressed by a spring' 2li" which when the pressure is cut ol'i, forces the valve into the position shewn, in which the ports l5), 2t) are closed and the burner is out ot' operation. .fin air vent I) is provided in the. chamber l.

lllhcn pressure is admitted through pipe 3l, the valve ll is moved and its port 35 connects the Yluel supply opening il?) with the 'port l) allowingl tuel to pass intoy the burner tube lilling' said tube up to the .seat ot needle valve ll. liinultaneouslv, port it) is opened and lluid pressure pa f into chamber 1T and into the extension sf and through the. holes 2T into the .stem

Thus at the seat Ll, the valve l5 regun lates the l'lovv oll Yfuel therethrough,- while the pressure passing out ot the hollow stein l5 is regulated by the interior needle valve 29 controlling seat The pressure thus 'forces the oil into the passage l2, vlbrming' the concentrating` chamber behind the nozzle., and through the passages 5 in the nozzle.

Pressure t'lnid is also passing through the casingV 3 and mixes with the 'luel 'forced through the nozzle carr vin the liet through the llame opening'.

1When the l'luid pressure is cnt otl, the valve '2l under the action ot springl 2l closes the tuel supply to the chamber 1T.

'llhe valves Yl5 and 2S) may be regulated by the operating handles 25, 3l respectively, thus providing' an etl'ective control of the 'luel passing' through the nozzle.

It desired, the control otl the fuel supply by Vfluid pressure may be. dispensed with.

In this case, a closed chamber ma;Y be provided on the outside ot the burner tube divided by a partition. lrlhe fuel is adnitted on one side ot the partition and passes through a suitable port into the burner tube, the tlnid pressure being a-dmitted on the other side ot the partition and passing thiough a suitable port to the hollow needle valve stem l5.

rl"his chamber may be cylindrical or ot other suitable shape. lilith this arrangementthe necessary regulation is obtained operation of the needle valves.

Having' thus described the nature of the said invention and the best means I know ot carrying the same into prac-tical effec-t, I claim:-

l. liquid fuel burner having` a lluid pressure chamber provided with a tluid opening.y a conical nozzle arranged in a burner tube in said opening and provided with two independent inclined passages meeting at a common point substantially at the tip ot said nozzle, a liquid fuel chamber con'ununicating with the burner tube, a valve seat in said tube. a hollow nee-:lle valve .stem operable 'lirom the outside olE the tube seatingon said seat, means Vlor admitting pressure lluid to the interior ot the valve. stem. and a second valve stein inside the lirst .stem and operable trom the outside o'l the bui ner tube Ylor regulating' the l'lou ot pressure lluid.

Q. A liquid 't'uel burner having a llnid pressure chamber provided with a llidd opening` a conical nozzle arranged in a burner tube in said opening' and provided with two independent inclined pasf'aeefl meeting' at a common point substautiallj.v at the tip et said nozzle. a liquid fuel chamber communicating with the burner tube. a valve seat in said tube, a hollow needle valve stem operable lrom the outside. ol the tube seating' on said seat, means t'or admitting pressure tluid to the interior ol' the. valve stem, a second valve stem inside the tit-st stem and operable trom the outside ot the burner tube tot' regulating the flow of pressure l'luid, a spring pressed valve in the luel chamber, the spring normally causing' the valve to cut ollI the Yfuel supply to the burner tube and means Ylor admittingy tluid pressure to the chamber to overcome the res' ance ot the sprinpl to open the valve to admit the tuel supply.

3. A liquid luel burner havinga lluid pressure chamber provided with a (luid opening, a conical nozzle arranged in a burner tube in said opening' and provided with two independent inclined passages meeting at a common point substantially at the tip ol said nozzle, a liquid 'tuel chainber communicatingwith the burner tube. a valve seat in said tube, a hollow needle valve stein operable from the outside oit the tube. seat-ing on said seat, means for admitting pressure tluid to the interior of the valve stem, a second valve stem inside the tiret stem and operable trom the outside olf the burner tube lfor regulating' the tlow of pressure fluidy a spring pressed valve in the 'luel chamber, the spring' normally causing' the valve to cut ott the 't'uel supply to the burner tube and a by-pass connection between the tluid pressure chamber at'. the nozzle and the tuel chamber to admit pressure t'luid to the fuel chamber.

In testimony whereof I have signed in v name to this speciheation.

DAVID ROBERTSON BRCE. 

